Effect of Alkalies on the Performance of Blast Furnace

Abstract

The influence of alkalies on the blast furnace operation has been discussed from the data collected from the Iron and Steel Co., Helwan, Egypt. The stability of the alkali compounds formed in the blast furnace was calculated from the thermodynamic data. The model of alkali circulation in the different zones of the furnace, as a function of temperature is proposed. Statistical analysis of alkalies from the input and output materials was calculated and discussed. The effect of alkalies on the partition of manganese and sulphur as well as on the rate of coke consumption was investigated. The relations between the alkali loadings, the basicity and the efficiency of alkali removal by the slag were discussed. Mathematical relations between these different parameters were given and correlated.